Yes, it's IDEA problem.

When IDEA is executing project (in debug mode), commandline looks like:

C:\Program Files\Java\jdk1.6.0_38\bin\java" -Dvisualvm.id=4187372098827 -Didea.launcher.port=7536 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 12.0.1\bin" -Dfile.encoding=UTF ...

OK, it should be a some weird problem within IDE, because I tried to start locally installed sh3d (using windows installer) and plugin was loaded (I see meny entry).

But what to do now. I need to debug the plugin ...

... I run it from within IDEA ide, using ...Bootstrap... main class, jar is copied manually into plugins folder.

Yes it is.

I tried to check if it is not a JDK version mismatch problem so I completely removed JDK7, installed JDK6, so my generated class is the same version as (for example) class from "Advanced Editing Plugin" - 32 hex = jdk 1.6.

Plugin still rejected, both on linux(64bit) and windows (64bit ...

Have the same problem.

My plugin:

public class TestPlugin extends com.eteks.sweethome3d.plugin.Plugin {
@Override
public PluginAction[] getActions() {
return new PluginAction[]{new TestAction()};
}
}

Application output:

Invalid plug-in jar:file:/home/msk/.eteks/sweethome3d/plugins/sh3d ...